Dynamic Shadows not "updating"

Hey,

I have a scene with a house in which only movable point lights are used. Unfortunately I have the problem that sometimes the dynamic shadows are not displayed when I walk further away and back again.

(Sometimes it takes a little while for the shadows to appear and sometimes no shadows are visible.)

Edit: The shadows come back as soon as I move a mesh or the light! As soon as I change the Static Meshes from “Static” to “Movable”, the shadows work.

I am using version 5.03. What could be the reason for this?

I hope someone has a solution for this problem.

Kind regards
Andrew